Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 110, NWS Pittsburgh, PA

June 18, 2017Mercer County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 18, 2017, 6:55 PM EDT for Mercer County, Pennsylvania. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 18, 2017, 6:55 PM EDT (22:55 UTC)
Expired: Jun 18, 2017, 7:30 PM EDT
In force: 35 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Mercer County, PA

The radar

The Pittsburgh radar (KPBZ), 86 km from the middle of the area, began a volume at 22:58 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 10.9 hours before the alert went out and 100 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 10 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 1243 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 6:24 PM EDT, 31 minutes earlier.

Area forecast discussion, Jun 18, 6:24 PM EDT, 31 minutes before

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Hazardous weather outlook, Jun 18, 4:13 AM EDT, 14 hours 42 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
413 AM EDT Sun Jun 18 2017

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-190815-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-
Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana-
Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette-
Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
413 AM EDT Sun Jun 18 2017

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania, west
central Pennsylvania, western Pennsylvania, northern West Virginia
and northern panhandle of West Virginia.

.DAY ONE...Today and Tonight.

Slight risk for severe thunderstorms this afternoon and evening. The
main severe threat is damaging winds and large hail. Thunderstorms
will be capable of producing heavy rain, which could lead to
flooding. This threat means there is a slight risk for excessive
rainfall this afternoon and evening as well.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
 conditions according to Standard Operating Procedures.

In the hours before

Local storm report, Jun 18, 4:45 PM EDT, 2 hours 10 minutes before

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Special weather statement, Jun 18, 4:50 PM EDT, 2 hours 5 minutes before

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Local storm report, Jun 18, 4:57 PM EDT, 1 hour 58 minutes before

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Local storm report, Jun 18, 5:08 PM EDT, 1 hour 47 minutes before

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Special weather statement, Jun 18, 5:29 PM EDT, 1 hour 26 minutes before

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Local storm report, Jun 18, 5:37 PM EDT, 1 hour 18 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 2:41 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	34 min
Jun 18, 2:51 PM EDT	Special Weather Statement	PBZ	Beaver	24 min
Jun 18, 3:10 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	35 min
Jun 18, 3:14 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Forest, Mercer, Venango	46 min
Jun 18, 3:27 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	33 min
Jun 18, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Jefferson, Venango	48 min
Jun 18, 4:14 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	46 min
Jun 18, 4:50 PM EDT	Special Weather Statement	PBZ	Allegheny	25 min
Jun 18, 5:29 PM EDT	Special Weather Statement	PBZ	Armstrong	31 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.